Description: Blad ECN
| Magazine | Date | Articles |
|---|---|---|
Energie Spectrum  | January 1990 | 4 |
| Energie Spectrum | February 1990 | 2 |
| Energie Spectrum | March 1990 | 4 |
| Energie Spectrum | April 1990 | 3 |
| Energie Spectrum | June 1990 | 2 |
| Energie Spectrum | July 1990 | 4 |
| Energie Spectrum | September 1990 | 3 |
| Energie Spectrum | October 1990 | 1 |
| Energie Spectrum | November 1990 | 10 |
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